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When it comes to process validation, FDA's Process Validation Guidance from 2011 is state-of-the-art. It is interesting to see how the FDA would like to see the guidance implemented. Here, the findings described in Warning Letters issued after FDA inspections can help. A recent Warning Letter regarding deficiencies to 21 CFR 211.100 from October 2019 mentions the following.

The issue of cross-contamination has been addressed by authorities since the publication of the first edition of the EU GMP Guidelines. The EMA has compiled everything essential on health-based exposure limits and PDE limits on their website.

With the revision of Annex 15 in October 2015, the topic of requalification has become more important. Time intervals for the assessment of the equipment with regard to the qualification status and for the requalification itself should be justified. Criteria for the assessment should be defined. This is sometimes difficult. Chapter 9 of the revised ISPE Baseline No 5 Commissioning & Qualification of June 2019 on the periodic review can be helpful here.

The ISPE Baseline Guide Vol. 5 on Commissioning & Qualification has been in place since 2001 and was thus no longer up to date. Recent developments, e.g. towards a lifecycle model, were not reflected in the document. Now the ISPE Baseline Guide Vol. 5 has been completely revised.